Enable goma in soong

When the UseGoma flag is set, put all rules except the C compilation
rule in an externally defined local_pool, which will have been created
by kati.  The gomacc wrapper will already be in the CC_WRAPPER
environment variable.

Bug: 31142427
Change-Id: I699d4edff2e302eee398dad8692ceb14721a628c

cc/gen.go

@@ -31,7 +31,7 @@ func init() {
 }
 
 var (
-	yacc = pctx.StaticRule("yacc",
+	yacc = pctx.AndroidStaticRule("yacc",
 		blueprint.RuleParams{
 			Command:     "BISON_PKGDATADIR=$yaccDataDir $yaccCmd -d $yaccFlags --defines=$hFile -o $cFile $in",
 			CommandDeps: []string{"$yaccCmd"},
@@ -39,7 +39,7 @@ var (
 		},
 		"yaccFlags", "cFile", "hFile")
 
-	lex = pctx.StaticRule("lex",
+	lex = pctx.AndroidStaticRule("lex",
 		blueprint.RuleParams{
 			Command:     "$lexCmd -o$out $in",
 			CommandDeps: []string{"$lexCmd"},